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Status Future consideration
Workspace Informix
Components Informix Server
Created by Guest
Created on Dec 3, 2019

Enhance availability of readahead performance details

With the ubiquity of intelligent storage, the value of readahead in the Informix server is reduced and excessive readahead can be detrimental to performance. However, since the introduction of the AUTO_READAHEAD parameter and the associated changes to the readahead algorithms in the engine that include readahead of data that was not included in earlier versions of the engine, not all readahead details are exposed for analysis making it impossible to tune the AUTO_READAHEAD setting accurately.

Also while some details are available through the onstat -g rah output, not all values are exposed there either and none of that information is available through the SMI interface. Only the even more limited details exposed by onstat -p are available in sysmaster.

Needed by Date Dec 31, 2019
  • Guest
    Dec 4, 2019

    The fact that the additional details are not included on the onstat output simply means that when the feature was added, someone neglected to include the additional stats in the monitoring.   So I'd vote Yes, if only to keep the onstat up-to-date with the available features.

     

    Question: Are these additional details available in Sysmaster?  And documented?  A feature undocumented is a feature denied!